3 SAFETY PRECAUTIONS SAFETY-RELATED COMPONENT WARNING! There are special components used in this color monitor which are important for safety. These parts are marked on the schematic diagram and the replacement parts list. It is essential that these critical parts should be replaced with the manufacturer's specified parts to prevent X-radiation, shock, fire, or other hazards. Do not modify the original design without obtaining written permission from manufacturer or you will void the original parts and labor guarantee. CAUTION: No modification of any circuit should be attempted. Service work should be performed only after you are thoroughly familiar with all of the following safety checks and servicing guidelines. SAFETY Care should be taken while servicing this color monitor because of the high voltage used in the deflection circuits. These voltages are exposed in such areas as the associated flyback and yoke circuits. FIRE & SHOCK HAZARD An isolation transformer must be inserted between the color monitor and AC power line before servicing the chassis. In servicing, attention must be paid to the original lead dress specially in the high voltage circuit. If a short circuit is found, replace all parts which have been overheated as a result of the short circuit. All the protective devices must be reinstalled per the original design. Soldering must be inspected for the cold solder joints, frayed leads, damaged insulation, solder splashes, or the sharp points. Be sure to remove all foreign materials. X-RADIATION The only potential source of X-radiation is the picture tube. However, when the high voltage circuitry is operating properly there is no possibility of an X-radiation problem. The basic precaution which must be exercised is keep the high voltage at the factory recommended level; the normal high voltage is about 25.5kV. The following steps describe how to measure the high voltage and how to prevent X- radiation. Note : It is important to use an accurate high voltage meter calibrated periodically. To measure the high voltage, use a high impedance high voltage meter, connect ( ) to chassis and (+) to the CDT anode cap. Set the brightness control to maximum point at full white pattern. Measure the high voltage. The high voltage meter should be indicated at the factory recommended level. If the meter indication exceeds the maximum level, immediate service is required to prevent the possibility of premature component failure. To prevent X-radiation possibility, it is essential to use the specified picture tube. CAUTION: Please use only a plastic screwdriver to protect yourself from shock hazard during service operation. IMPLOSION PROTECTION All used display tubes are equipped with an integral implosion protection system, but care should be taken to avoid damage and scratching during installation. Use only same type display tubes

5 OPERATING INSTRUCTIONS FRONT VIEW REAR VIEW See Front Control Panel Power ON/OFF Button AC Power Socket Signal Connector Front Control Panel Power/LED Controls power to the monitor. The LED on the power button is illuminated when the power is on. 2. Right Adjustment Moves clockwise through menu options or increases adjustment levels. 3. Left Adjustment Moves counter-clockwise through menu options or decreases adjustment levels. 4. Select Launches on-screen displays, selects functions and adjustments, and exits menus and On-Screen Display. 5. Hot Key Left Adjustment Just select left adjustment key without OSD display. Contrast menu display. Right adjuatment Just select right adjustment key with OSD display. Brightness menu display

8 DESCRIPTION OF BLOCK DIAGRAM 1. Line Filter & Associated Circuit. This is used for suppressing noise of power input line flowing into the monitor and/or some noise generated in this monitor flowing out through the power input line. That is to say, this circuit prevents interference between the monitor and other electric appliances. 2. Degauss Circuit & Coil. The degauss circuit consists of the degaussing coil, the PTC(Positive Temperature Coefficient) thermistor(th901), and the relay(rl901). This circuit eliminates abnormal color of the screen automatically by degaussing the shadow mask in the CRT during turning on the power switch. When you need to degauss in using the monitor, select DEGAUSS on the OSD menu. 3. SMPS(Switching Mode Power Supply). This circuit is working of 90~264V AC(50/60Hz). The operation procedure is as follows: 1) AC input voltage is rectified and smoothed by the bridge diodes (D900) and the capacitor (C908). 2) The rectified voltage(dc) is applied to the primary coil of the transformer(t901). 3) The control IC(IC901) generates switching pulse to turn on and off the primary coil of the transformer (T901) repeatedly. 4) Depending on turn ratio of the transformer, the secondary voltages appear at the secondary coils of the transformer(t901). 5) These secondary voltages are rectified by each diode(d941, D942, D951, D961, D962, D971) and operate other circuit. (horizontal and vertical deflection, video amplifier,...etc.) 4. Display Power Management Circuit. This circuit control power consumption of the monitor by detecting H and V sync signal. There are off mode. When no horizontal or vertical sync signal input, the circuit consists of Q941 and Q951 becomes off mode. It s power consumption is below 5W. 5. X-ray Protection. If the high voltage of the FBT reaches up to 29kV (abnormal state), IC401(MICOM) pin 35 Sensing from FBT directly. Then MICOM control IC701 (Deflection controller) to stop Horizontal drive pulse and stop Horizontal Deflection. 6. Micom(Microprocessor) Circuit. The operating procedure of Micom(Microprocessor) and its associated circuit is as follows: 1) H and V sync signal is supplied from the signal cable. 2) The Micom(IC401) distinguishes polarity and frequency of H and V sync. 3) The Micom sets operating mode and offers the controlled data. (H-size, H-position, V-size,... etc.) 4) The controlled data of each mode is stored in itself. 5) User can adjust screen condition by each OSD function. The data of the adjusted condition is stored in EEPROM(IC402). 7. Horizontal and Vertical Synchronous Processor. This circuit generates the horizontal drive pulse and the vertical drive pulse by taking sync-signal from the Signal- Cable. This circuit consists of the TDA4857(IC701) and the associated circuit. 8. D/D(DC to DC) Converter. This circuit supplies DC voltage to the horizontal deflection output circuit by increasing DC 50V which is the secondary voltage of the SMPS in accordance with the input horizontal sync signal. 9. Side-Pincushion & Trapezoid Correction Cirucit. This circuit improves the side-pincushion and the trapezoid distortion of the screen by mixing parabola and saw-tooth wave to output of the horizontal deflection D/D converter which is used for the supply voltage(b + ) of the deflection circuit. 10. Horizontal Deflection Output Circuit. This circuit makes the horizontal deflection by supplying the saw-tooth current to the horizontal deflection yoke. 11. High Voltage Output & FBT(Flyback Transformer). The high voltage output circuit is used for generating pulse wave to the primary coil of the FBT(Flyback Transformer). A boosted voltage(about 25.5KV) appears at the secondary of the FBT and it is supplied to the anode of the CDT. And there are another output voltages such as the dynamic focus and the screen voltage(g2). 12. H-Linearity Correction Circuit. This circuit corrects the horizontal linearity for each horizontal sync frequency. 13. Vertical Output Circuit. This circuit takes the vertical ramp wave from the TDA4857(IC701) and performs the vertical deflection by supplying the saw-tooth current from the TDA4866(IC601) to the vertical deflection yoke. 14. Dynamic Focus Output Circuit. This circuit takes the horizontal and the vertical parabola waves from the TDA4857(IC701) and amplifies it to maintain constant focus on center and corners in the screen

9 15. H & V Blanking and Brightness Control. Blanking circuit eliminates retrace line by supplying negative pulse to the G1 of the CRT. And Brightness circuit is used for control of the screen brightness. 16. Image Rotation (Tilt) Circuit. This circuit corrects the tilt of the screen by supplying the image rotation signal to the tilt coil which is attached near the deflection yoke of the CRT. 17. OSD Circuit This circuit is used for performing the OSD(On-Screen- Display) function. When a user selects the OSD Select/Adjustment control, the adjustment status displays on the screen. 18. Video Pre-Amp Circuit. This circuit amplifies the analog video signal from 0-0.7V to 0-4V. It is operated by taking the clamp, R, G, B drive and contrast signal from the Micom(IC401). 19. Video Output Amp Circuit. This circuit amplifies the video signal which comes from the video pre-amp circuit and amplified it to applied the CRT cathode

10 ADJUSTMENT GENERAL INFORMATION All adjustment are thoroughly checked and corrected when the monitor leaves the factory, but sometimes several adjustments may be required. Adjustment should be following procedure and after warming up for a minimum of 30 minutes. Alignment appliances and tools. - IBM compatible PC. - Programmable Signal Generator. (eg. VG-819 made by Astrodesign Co.) - EPROM or EEPROM with saved each mode data. - Alignment Adaptor and Software. - Digital Voltmeter. - White Balance Meter. - Luminance Meter. - High-voltage Meter. AUTOMATIC AND MANUAL DEGAUSSING The degaussing coil is mounted around the CDT so that automatic degaussing when turn on the monitor. But a monitor is moved or faced in a different direction, become poor color purity cause of CDT magnetized, then press DEGAUSS on the OSD menu. ADJUSTMENT PROCEDURE & METHOD - Install the cable for adjustment such as Figure 1and run the alignment program on the DOS for IBM compatible PC. - Set external Brightness and Contrast volume to max position. 1. Adjustment for B + Voltage. 1) Display cross hatch pattern at Mode 8. 2) Check C999 (+) voltage to 50± 0.5Vdc. 2. Adjustment for High-Voltage. 1) Display cross hatch pattern at Mode 8. 2) DIST.ADJ CTRL PWM High Voltage Command. 3) Adjust High Voltage to 25.5kV±0.3 kvdc. 4) Press Enter Key. 3. Adjustment for Factory Mode (Preset Mode). 1) Display cross hatch pattern at Mode 1. 2) Run alignment program for CQ771G on the IBM compatible PC. 3) EEPROM ALL CLEAR Y(Yes) command. <Caution> Do not run this procedure unless the EEPROM is changed. All data in EEPROM (mode data and color data) will be erased. 4) Power button of the monitor turn off turn on. 5) COMMAND PRESET START Y(Yes) command. 6) DIST. ADJ. CTRL PWM TILT command. 7) Adjust tilt as arrow keys to be the best condition. 8) DIST. ADJ. BALANCE command. 9) Adjust parallelogram as arrow keys to be the best condition. 10) Adjust balance of pin-balance as arrow keys to be the best condition. 11) DIST. ADJ. FOS. ADJ command. 12) Adjust V-SIZE as arrow keys to 234±2mm. 13) Adjust V-POSITION as arrow keys to center of the screen. 14) Adjust H-SIZE as arrow keys to 312±2mm. 15) Adjust H-POSITION as arrow keys to center of the screen. 16) Adjust S-PCC (Side-Pincushion) as arrow keys to be the best condition. 17) Adjust TRAPEZOID as arrow keys to be the best condition. 18) Save of the Mode 1. 19) Display from Mode 1 to 8 and repeat above from number 12) to 19) 20) PRESET EXIT Y (Yes) command. 4. Adjustment for White Balance and Luminance. 1) Set the White Balance Meter. 2) Press the DEGAUSS on the OSD menu for demagnetization of the CDT. 3) COLOR ADJ. LUMINANCE command of the alignment program. 4) Set Brightness and Contrast to Max position. 5) Display color 0,0 pattern at Mode 8. 6) COLOR ADJ. BIAS ADJ. COLOR No. 1 command of the alignment program. 7) Check whether green color or not at R-BIAS and G- BIAS to min position and B-BIAS to 127(7F) and Sub-Brightness to 177(B1) position. Adjust G2 (screen) command to 0.4± 0.05FL of the raster luminance. 8) Adjust R-BIAS and G-BIAS command to x=0.283± and y=0.298±0.005 on the White Balance Meter with PC arrow keys. 9) Adjust SUB-Brightness command to 0.5±0.1FL of the raster luminance. 10) Adjust repeat number 8). 11) After push the ENTER key. 11-1) COMMAND PRESET START Y(Yes) command. 12) Display color 15,0 full white pattern at Mode 8. 13) DRIVE ADJ. No 1. command

Kit 106 50 Watt Audio Amplifier T his kit is based on an amazing IC amplifier module from ST Electronics, the TDA7294 It is intended for use as a high quality audio class AB amplifier in hi-fi applications

POWER SUPPLY MODEL XP-15 Instruction Manual ELENCO Copyright 2013 by Elenco Electronics, Inc. REV-A 753020 All rights reserved. No part of this book shall be reproduced by any means; electronic, photocopying,

Three Stages BATTERY CHARGER BC 0 0A SERVICE MANUAL Warning! Qualified personnel who are familiar with the risks involved and relevant regulations may only carry out maintenance and repair work. To avoid

focus TOuCh P10 FOR DISPLAYS: 55, 70 AND 82 ENgliSh V01.3-2014-7 Thank you for purchasing our product. Please read this manual carefully before operation your set and retain it for future reference. FT55-P10

User and installation manual aquaero 5 The information contained in this manual is subject to change without prior notice. All rights reserved. Current as of April 2011 ENGLISH: PAGE 1 DEUTSCH: SEITE 13

CURRENT MODE PWM CONTROLLER WITH BUILT-IN HIGH VOLTAGE MOSFET DESCRIPTION SD4840/4841/4842/4843/4844 is a current mode PWM controller with low standby power and low start current for power switch. In standby

Version 1.3 Created in December 2004 Instruction Manual for IV-08MTV LCD Color Monitor Thank you for purchasing our IV-08MTV LCD Color Monitor. Before using it, read this manual carefully to become familiar

Data sheet 1.44 kw Programmable DC Power Supplies XLN Series New Family of High Density System Power Supplies The B&K Precision XLN series are compact, programmable, single-output DC power supplies, suitable

DIGITAL PC SCOPE Digital storage oscilloscoop, using a computer and its monitor to display waveforms. All standard oscilloscope functions are available in the Windows program supplied. Total solder points:

GLOLAB Universal Telephone Hold 1 UNIVERSAL HOLD CIRCUIT If you have touch tone telephone service, you can now put a call on hold from any phone in the house, even from cordless phones and phones without

UPS61 UNISONIC TECHNOLOGIES CO., LTD HIGH PERFORMANCE CURRENT MODE POWER SWITCH DESCRIPTION The UTC UPS61 is designed to provide several special enhancements to satisfy the needs, for example, Power-Saving

SMPS Controller www.fairchildsemi.com Features Low Start up Current Maximum Duty Clamp UVLO With Hysteresis Operating Frequency up to 500KHz Description The UC3842/UC3843/UC3844/UC3845 are fixed frequencycurrent-mode

FX14 Field Controller (1/4) FX14 Field Controller The FX14 is an equipment field controller in the Facility Explorer range of products. The controller is designed specifically for commercial Heating, Ventilating,

Lambda s new SM Series of Power Modules are ideally designed for Telecommunications and Network applications. Technical Data SM20-24 Singles Series of Power Modules Lambda Electronics, Inc. 515 Broad Hollow

LOXONE 12 Channel Amplifier Item no.: 200110 Thank you for purchasing the Loxone Twelve Channel Amplifier. The versatility of the Amplifier makes it the perfect choice for almost every type of custom multi-room

Rack mounted telephone- and leased line modem for industrial applications TR-6 Rack modem for industrial PSTNand /-wire leased line applications The TR-6 is an analogue V. 9 -rack PSTN modem as well as

Telephone- and leased line modem for industrial applications TD-36 Modem for industrial PSTN- and leased line applications The TD-36 is an analogue V.34 PSTN modem as well as an industrial 2-wire leased

The George Washington University School of Engineering and Applied Science Department of Electrical and Computer Engineering Final Design Report Dual Channel Stereo Amplifier By: Kristen Gunia Prepared

Model Number Single head system Features Parameterization interface for the application-specific adjustment of the sensor setting via the service program ULTRA 000 programmable switch outputs Hysteresis